MORA™ Performance Enhancement: When fitted and worn correctly, it positions the lower jaw down and forward and the tongue up onto the roof of the mouth, which may increase strength and athletic performance

Convertible, quick-release tether allows it to be used with or without the strap

The inside gel material makes a nice comfortable fit but the outer material is too rough on the inside of your mouth. I used this mouth piece twice, each time it left the inside of my mouth raw. I will leave this one in the bottom of my gym bag and stick with my $10 gel mouth piece.